On Fri, Feb 18, 2022 at 05:39:10PM +0100, Jens Wiklander wrote:
> commit aceeafefff736057e8f93f19bbfbef26abd94604 upstream
>
> Adds a driver private tee_context to struct optee.
>
> The new driver internal tee_context is used when allocating driver
> private shared memory. This decouples the shared memory object from its
> original tee_context. This is needed when the life time of such a memory
> allocation outlives the client tee_context.
>
> This fixes a problem where the tee_context allocated on behalf of a
> process outlives the process because some longer lived driver internal
> shared memory has been allocated using that tee_context.
>
> Fixes: 217e0250cccb ("tee: use reference counting for tee_context")
> Reported-by: Lars Persson <larper@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 1e2c3ef0496e tee: export teedev_open() and teedev_close_context()
> Cc: stable@xxxxxxxxxxxxxxx
> Reviewed-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
> [JW: backport to 5.4-stable + update commit message]
> Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
> ---
>
> Hi,
>
> Please note that this patch depends on 1e2c3ef0496e ("tee: export
> teedev_open() and teedev_close_context()") which needs be cherry-picked
> before this patch is applied.
>
> This differs from the previous backports (5.16, 5.15, 5.10) in the way that
> f25889f93184 ("optee: fix tee out of memory failure seen during kexec
> reboot") isn't in this branch. So we can't claim to fix that problem, but
> this patch still makes sense since the lifetime problem can manifest itself
> in other ways too.
Now queued up, thanks.
greg k-h
